Details:

Personal Author:
Kneisley, R. O. (Richard O.) ; Rock, Alan D. ;
Kneisley, R. O. (Richard O.) ; Rock, Alan D. ; Less -
Corporate Authors:
United States. Bureau of Mines. ;
Description:
"An empirical method, based on U. S. Bureau of Mines field studies in several Western U.S. coal mines, is presented for sizing gate road yield pillars. Discriminant analysis was used to generate functions separating successful from unsuccessful case studies. These functions relate the pillar width-height and extraction ratios and a pillar development factor to the Coal Mine Roof Rating System (CMRR), and are assumed to establish three criteria that other entry systems, under similar conditions, must satisfy. A program, Pillar Sizer, from user-provided inputs, generates a range of pillar sizes that meets the proposed criteria. Although the analysis is based on a sample consisting primarily of two-entry systems, the derived expressions generate pillar sizes closely agreeing with observed, two-entry and three-entry in situ pillars. It is concluded that the proposed approach should assist mine operators estimate entry system yield pillar dimensions." - NIOSHTIC-2 NIOSHTIC no. 10005498
Subject:
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Gate Roads (Mining)
Pillaring (Mining)
Pillaring (Mining)/Computer Programs

Document Type:
Report ;
Collection(s):
Stephen B. Thacker CDC Library collection
National Institute for Occupational Safety and Health
Main Document Checksum:
[+]
urn:sha256:3dc0ce0fedcff657ffd14ac93b87a2603e9844e05e8dbbde5baabe40c04ac148
File Type:

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